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Home >> Toyota >> 2021 >> 4Runner Trail, RWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System - Diagnostic Codes (B1690-B1905) & Symptom Tests >> Airbag System >> DTC B1860: Short in Knee Airbag (D Side) Squib Circuit; DTC B1861: Open in Knee Airbag (D Side) Squib Circuit; DTC B1862: Short in Knee Airbag (D Side) Squib Circuit (to Ground); DTC B1863: Short in Knee Airbag (D Side) Squib Circuit (to +B) [08/2019 - ] >> Procedure

DTC B1860: Short in Knee Airbag (D Side) Squib Circuit; DTC B1861: Open in Knee Airbag (D Side) Squib Circuit; DTC B1862: Short in Knee Airbag (D Side) Squib Circuit (to Ground); DTC B1863: Short in Knee Airbag (D Side) Squib Circuit (to +B) [08/2019 - ]: Procedure

  1. CHECK LOWER NO. 1 INSTRUMENT PANEL AIRBAG (DRIVER SIDE KNEE SQUIB) 
    1. Turn the ignition switch off.
      GTY703312Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Disconnect the connector from the lower No. 1 instrument panel airbag.
    4. Connect the white wire side of SST (resistance: 2.1 Ω) to connector C.
      WARNING:

      Never connect the tester to the lower No. 1 instrument panel airbag (driver side knee squib) for measurement, as this may lead to a serious injury due to airbag deployment.

      NOTE:
      • Do not forcibly insert SST into the terminals of the connector when connecting SST.
      • Insert SST straight into the terminals of the connector.
      • SST: 09843-18061 
    5. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    6. Turn the ignition switch to ON, and wait for at least 60 seconds.
    7. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2019 - ] ).
    8. Turn the ignition switch off.
    9. Turn the ignition switch to ON, and wait for at least 60 seconds.
    10. Check for DTCs (Refer to DTC CHECK / CLEAR [08/2019 - ] ).

      OK

      DTC B1860, B1861, B1862 or B1863 is not output.

      HINT: 

      Codes other than DTC B1860, B1861, B1862 and B1863 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

      *1 Driver Side Knee Squib
      *2 Airbag Sensor Assembly
      *3 Connector C
      *4 SST
      *a Front view of wire harness connector
      (to Driver Side Knee Squib)

    Result: 

    OK 

    REPLACE LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    NG 

    See step  2

  2. CHECK CONNECTOR 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Disconnect SST from connector C.
    4. Check that the instrument panel wire connector (on the lower No. 1 instrument panel airbag side) is not damaged.

      OK

      The lock button is not disengaged, and the claw of the lock is not deformed or damaged.

      GTY671655Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Driver Side Knee Squib
      *2 Airbag Sensor Assembly

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  3

  3. CHECK INSTRUMENT PANEL WIRE (DRIVER SIDE KNEE SQUIB CIRCUIT) 
    1. Disconnect the connectors from the airbag sensor assembly.
      GTY735963Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      F12-1 (DK+) - Body ground Ignition switch ON Below 1 V
      F12-2 (DK-) - Body ground Ignition switch ON Below 1 V
    4. Turn the ignition switch off.
    5. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F12-1 (DK+) - F12-2 (DK-) Always Below 1 Ω
    7. Release the activation prevention mechanism built into connector B (Refer to DIAGNOSIS SYSTEM [08/2019 - ] ).
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F12-1 (DK+) - F12-2 (DK-) Always 1 MΩ or higher
      F12-1 (DK+) - Body ground Always 1 MΩ or higher
      F12-2 (DK-) - Body ground Always 1 MΩ or higher
      TEXT IN ILLUSTRATION

      *1 Driver Side Knee Squib
      *2 Instrument Panel Wire
      *3 Airbag Sensor Assembly
      *4 Connector C
      *a Front view of wire harness connector
      (to Driver Side Knee Squib)

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  4

  4. CHECK AIRBAG SENSOR ASSEMBLY 
    1. Connect the connectors to the lower No. 1 instrument panel airbag and airbag sensor assembly.
      GTY735445Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    3. Turn the ignition switch to ON, and wait for at least 60 seconds.
    4. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2019 - ] ).
    5. Turn the ignition switch off.
    6. Turn the ignition switch to ON, and wait for at least 60 seconds.
    7. Check for DTCs (Refer to DTC CHECK / CLEAR [08/2019 - ] ).

      OK

      DTC B1860, B1861, B1862 or B1863 is not output.

      HINT: 

      Codes other than DTC B1860, B1861, B1862 and B1863 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

      *1 Driver Side Knee Squib
      *2 Airbag Sensor Assembly

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK 

    (Refer to DIAGNOSIS SYSTEM [08/2019 - ] )

    Result: 

    NG 

    REPLACE AIRBAG SENSOR ASSEMBLY 

    (Refer to REMOVAL [08/2015 - ] )

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